Sewing machine



(No Model.) 2 Sheets-S11eet 1.

-W. F. DIAL.

SEWING- MACHINE.

N0. 446,830. Patentedv Feb. 17,1891.

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(No Model.)

2 Sheets-Sheet' 2. W. I'. DIAL.

SEWING MACHINE.

Patented Feb. 17,1891,

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UNITED STATI-:S

PATENT OFFICE.

WILBUR F.r DIAL, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO TIIE WHEELER du WILSON MANUFACTURING COMPANY, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 446,830, dated February 17, 1891.

i Application filed January 3, 1890. Serial No. 336,275. (No model.)

To all whom t may con/cern:

Be it known that I, WILBUR F. DIAL, of Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Sewing-Machines. of which the following description, in connection with the accompanying drawings, is a specification, like letters and gures on the drawings representinglike parts.

The invention relates to sewing-machines which are provided with two needles for sewing parallel seams.

The principle of the invention and the manner in which I have contemplated applying that principle will be described first, and then I will proceed particularly to point out and distinctly claim the part, improvement,.or combination which I claim as my invention.

In the accompanying drawings, illustrating my invention,in the several figures of which like parts are similarly designated, Figure 1 is a partial end elevation below the bed-plate of a sufficient portion of a sewing-machine to enable the invention herein to be described to be understood, the figure showing part of the needle-bar, with its two needles, and part of the presser-bar, the presser-foot and devices common to the Wheeler da )Wilson system of machine being omitted, the figure showing also a portion of the upright part of the usual overhanging arm. Fig. 2 shows the loop-taker detached. Fig. 3 shows in front elevation and plan view the loop-taker Fig. 4is a plan view of part of the bed of the machine with the usual cover-slides removed; Fig. 5, a detail of the loop-taker guide, loop-taker, and loop-'taker driver in a different position.

The bed-plate A, having the upright A to. support the usual overhanging arm containing the usual presser-bar H, the needle-bar A4, and the main under shaft Cif; the short shaft B6 to actuate the loop-taker driver, to be described; the variable speed device between the s aid two shafts, it consisting, as' shown, of the disk B3, fast on the shaft Cf, the arm B, fast on the shaft B6, and the link B4, connecting the said disk and arm the bobbin-case a, and the holder D7, to prevent it from rotating with the loop-.taker G and the disk-bobbin f (shown in Fig. 1) by breaking out the bobbin-case, are and may be all as in the Wheeler d: )Vilson machine constructed substantially in accordance with United States -Patent No. 328,165.

The needle-bar A4 has connected to it by a screw a3 a needle-holding block at, provided with two needles 2 3, set in a line diagonal both to the direction of the movement of the feed and to the center of the maink shaft Cf, (see Figs. 1 and 4,) so that the said needles may penetrate the material close to each other and enable the said two needles, each properly supplied with thread, to have their loops cast about the bobbin containing an under thread for the formation of parallel lines of lock-stitches. The needles are held in the holding-block a4 each by its own screw 24.

As the needles 2 3 are set diagonally, as stated, the loop-taker G has to be rotated in a vertical plane oblique to the vertical plane intersecting the line of the feed and also oblique to the center line of the Inain shaft Cf, and in order to enable the point w of the loop-taker to enter the loops of thread thrown out from the two needles I have shown the loop-taker as adapted to be movedin a guide F, the said guide being arranged to occupy a position in a vertical plane oblique to a horizontal line drawn at right angles to the center line of the main shaft C* (best shown in f Fig. 4) and also oblique to a horizontal line drawn longitudinally through the feed.

The loop-taker driver C has a projection h to engage the heel 7L of the loop-taker, and an engaging device 7b2 to enter the space h3 back of the point w of the loop-taker, (see Fig. 2,) as in said patent, and in order to insure the placing of one or both needles in the oblique line in which the point of the looptaker travels the said driver has been provided with' an outwardly-extended nger t, shaped to leave a space e in advance of the point w ofthe loop-taker in the direction of its rotation and when the point w is about to enter the loops of thread of the two needles 2 3, (the said needles after passing below the usual throat-plate entering said space and then rising to throw out loops of their thread in usual inanner,) the said loops heilig entered by the point of the loop-taker.

Viewing Fig. i it will be seen that the two needles il 3 are set diagonally with relation not only to the line ',1/ y parallel to the line of feed movement, but also to the line y', which designates the center of the shaft Cf.

The loop-taker G has a circular movement in a vertical plane oblique to the horizontal line `y2 y2, drawn at right angles to the main shaft Cf, and also oblique to the horizontal line Iy y, drawn parallel to the longitudinal eenterof the usual feeding device, the oblique plane in which the loop-taker moves being designated by the horizontal line y? yi.

The needles 2 and 3 are shown as set atopposite sides of the line ,1/*2 y2, and hence the loop-taker, moving in a vertical plane designated by the horizontal oblique line 1/2 1/*2, would not enter the loops of thread carried by the said needle, and to place these needles in the said oblique line the fingert has been provided with a canrsurfacel and the driver with a cam-surface 5, said surfaces pushing or deflecting the needles from the position Fig. 4 into the position shown in Fig. 5, both needles beingacted upon between their points and eyes, so as not to chate orbreak the needle-thread, the said needles being guided or positioned by the substantially parallel walls o 7 yas the point zu of the loop-taker enters the loops of thread carried by the said needles. The lines of stitching at the surface of the fabric are parallel, but close together.

'llhebed of the lnachine at its under side has suitable lugs to sustain an annular curb g, which serves as a bearing for the feed device 9"', herein shown as a toothed ring having an annular rib S, which is engaged by a forked stud l0 on a curved arm 7L, one end of which is jointed by link 7H to an arm hs of a rock-shaft g', used to aetuate the feed. Thearm h near its other end has a stud 7H, to which is connected a spring lf, attached at its other end to a fixed part of the machine. As the arm h6 is lifted bythe link it? the forked stud 10 is made to grasp theV rib 8, and in the further rise of the link it? the arm h is moved longitudinally and takes the fecdwheel with it in the direction of the arrow thereon to effect the feeding of the material in the line y 1/ at right angles te the line y. The spring hg@ draws the arm 7a back and slides the dog or stud 10 on the rim S as the link h7 is lowered, the notched dog or detent hw, acted upon by the spring LA2 at such time, aiding in preventing any retrograde movement of the feeding device g.

Instead of the feeding device y, (shown as a wheel,) I may use the feeding device shown in the said patent. A flat spring 25 (shown in dotted lines, Fig. l) is attached by ascrew 26 to the curb g and bears on the ring to prevent any overthrow movement of the ring.

To co-operate with the wheel-like feeding device, the presser-bar is herein shown as having a roller pressure r of usual construct-ion; but instead l might use any other usual form of presser, especially if the feeding device was a bar having four motions.

Believing the machine herein described to be the first devised to simultaneously stitch parallel lock-stitch seams by the use of two needles set diagonally, as described, in one needle-bar and by one loop-taker rotated in a vertical plane oblique to a horizontal line drawn parallel to the longitudinal center of the feed and to a horizontal line drawn at right angles to the main shaft, the said looptaker casting both loops of needle-thread about one bobbin, the invention herein contained is not to be limited to the exact form of loop-taker to enter the loops of needlethread and cast them both about a bobbin containing the under thread, nor to the exact means for moving the loop-taker in a eircular path, nor to the exact construction of the loop-taker, as the invention will include any known equivalent. The finger t is shown as provided with a portion 20, it acting on the bobbin-th read bet-Ween the bobbin and the under side of the work to draw from the bobbin sufficient thread for another stitch, the said portion being so constructed as to be adjustable toward or from the needle to adapt it to be turned or moved toward or from the needle to pull more or less thread from the bobbin according to the particular work to be done or width of seam. This part of my invention is not, however, limited to the particular means for effecting said adjustinent.

I have herein shown the portion 20 as held in place by a clamp-screw I am aware prior to my invention that a sewing-machine having two needles arranged diagonally to the feed and having an oscillatin g shuttle working in a vertical plane parallel to the feed has been provided with a take-u p to give up to one needle more thread than to the other needle, to thus make for that needle farthest from the shuttle a larger loop for the entrance of the shuttle, and so, also, I am aware that a sewing-machine has been made having its shuttle tipped over sidewise at the top to occupy a diagonal position with relation to a vertical plane, as in United States latent No. 98,390; but neither of the machines shown in the said patents nor both of the machines taken together show the features herein made the subject of claim.

I claim-- l. In a sewing-inacl'iinc for simultaneously sewing parallel seams, the following instrumentalities, viz: a needle-bar containing two eye-pointed needles set in a line diagonally with relation to the feed and te the length of the main shaft of the machine, means to move the needle-bar, a take-up for the threads carried by the said needles, a loop-taker, a looptaker guide arranged in a vertical plane oblique to a horizontal line drawn at right angles to the main shaft and to ahorizontal line IOO IIO

drawn longitudinally through the feed, a bobbin and bobbin-case, a feeding device to feed the material at right angles to the main shaft, a main shaft, a loop-taker driver, and means to actuate the said loop-taker driver and looptaker from the main shaft, whereby the looptaker is moved in a circular pat-h in avertical plane oblique to ahorizontal line drawn at right angles to the main shaft and to a horizontal line drawn longitudinally through the feed, substantially as described.

2. In a sewing-machine for simultaneously sewing parallel seams, the following instrumentalities, viz: a needle-bar containing two eye-pointed needles 'set in a line diagonally with relation to the feed and to the length of the main shaft of the machine, means to move the needle-bar, a take-up for the threads carried by the said needles, a loop-taker, a looptaker guide arranged in a vertical plane oblique to a horizontal line drawn at right angles to the main shaft and to a horizontal line drawn longitudinally through the feed, a bobbin and bobbin-case, a feeding device to feed the material at right angles to the main shaft, a main shaft, a loop-taker driver, and means to actuate the said loop-taker driver at avariable speed from the main shaft, whereby the loop-taker is moved in a circular path in a vertical plane oblique to a horizontal line drawn at right angles to the main shaft and to a horizontal line drawn longitudinally through the feed, substantially as described.

8. In. a sewing-machine for simultaneously sewing yparallel seams, the following instrumentalities, viz: a needle-bar containing two eye-pointed needles set in a line diagonally with relation to the feed and to the length of the main shaft of the machine, means to move the needle-bar, a take-up for the threads carried by the said needles, a loop-taker, a looptaker guide arranged in a vertical plane oblique to a horizontal line drawn at right an-l gles to the main shaft and to a horizontalline drawn longitudinally through the feed, abobbin and bobbin-case, a feeding device to feed the material at right angles to the main shaft, a main shaft, a loop-taker driver, a circularlymoving delector to act upon and deflect one or both of said needles, as described, and means to actuate Ithe said loop-taker driver and loop-taker from the main shaft, whereby the loop-taker is moved in a circular path in a vertical plane oblique to a horizontal line drawn at right angles to the main shaft and to a horizontal line drawn longitudinally through the feed, substantially as described.

l. The loop-taker, the loop-taker driver, and the bobbin-ease, combined with the adjustable portion secured to the said driver and arranged to act on the bobbin-thread and pull from the bobbin a supply of bobbin-thread for the next stitch, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NVILBUR F. DIAL. Witnesses:

Guo. W. GREGORY, B. DEWAR. 

